U.S. patent application number 12/963196 was filed with the patent office on 2011-06-23 for control arrangement for a valve-controlled hydrostatic displacement unit.
Invention is credited to Bjoern Beuter, Alejandro Lopez Pamplona.
Application Number | 20110146256 12/963196 |
Document ID | / |
Family ID | 43992941 |
Filed Date | 2011-06-23 |
United States Patent
Application |
20110146256 |
Kind Code |
A1 |
Lopez Pamplona; Alejandro ;
et al. |
June 23, 2011 |
CONTROL ARRANGEMENT FOR A VALVE-CONTROLLED HYDROSTATIC DISPLACEMENT
UNIT
Abstract
A control arrangement for a valve-controlled hydrostatic
displacement contains a control unit for controlling the
valve-controlled hydrostatic displacement machine, a sensor
electronics portion for detecting sensor data of a power
electronics portion and of the valve-controlled hydrostatic
displacement machine, and the power electronics portion for
furnishing a current necessary for operating the valve-controlled
hydrostatic displacement machine. The control unit, the sensor
electronics portion, and the power electronics portion are
connected, as are the sensor electronics portion, the power
electronics portion, and the valve-controlled hydrostatic
displacement machine, which in turn are each connected to one
another via bidirectional communications lines. The functionalities
of the control unit, the sensor electronics portion, the power
electronics portion, and the valve-controlled hydrostatic
displacement machine are assigned, separately from one another, to
these units and portions, and data and information are capable of
being exchanged between these units and portions. The control unit
is arranged for detecting information from the sensor electronics
portion, the power electronics portion, and/or the valve-controlled
hydrostatic displacement machine, centrally in only the control
unit, and reacting to information which represents a changed
situation and, in an interacting fashion, adapting the sequence
control for the valve-controlled hydrostatic displacement
machine.
Inventors: |
Lopez Pamplona; Alejandro;
(Horb, DE) ; Beuter; Bjoern; (Hirrlingen,
DE) |
Family ID: |
43992941 |
Appl. No.: |
12/963196 |
Filed: |
December 8, 2010 |
Current U.S.
Class: |
60/403 ;
60/463 |
Current CPC
Class: |
B60R 16/03 20130101;
F04B 49/065 20130101; B60R 16/02 20130101 |
Class at
Publication: |
60/403 ;
60/463 |
International
Class: |
F15B 21/02 20060101
F15B021/02; F15B 21/08 20060101 F15B021/08 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 15, 2009 |
DE |
10 2009 058 365.3 |
Claims
1. A control arrangement for a valve-controlled hydrostatic
displacement machine, comprising: at least one control unit for
controlling the valve-controlled hydrostatic displacement machine;
a sensor electronics portion for detecting sensor data of a power
electronics portion and of the valve-controlled hydrostatic
displacement machine; and the power electronics portion for
furnishing a current, necessary for operating the valve-controlled
hydrostatic displacement machine, via power-transmitting line
connections between the power electronics portion and the
valve-controlled hydrostatic displacement machine; wherein the at
least one control unit, the sensor electronics portion, and the
power electronics portion, as well as the sensor electronics
portion, the power electronics portion, and the valve-controlled
hydrostatic displacement machine are each connected to one another,
via bidirectional communications lines, which differ from the
power-transmitting line connections, in such a way that
functionalities of the at least one control unit, the sensor
electronics portion, the power electronics portion, and the
valve-controlled hydrostatic displacement machine are assigned,
separately from one another to these units and portions, and data
and information are capable of being exchanged between these units
and portions; and the at least one control unit is arranged for
detecting information from the sensor electronics portion, the
power electronics portion, and/or the valve-controlled hydrostatic
displacement machine, centrally in only the at least one control
unit, and reacting to information which represents a changed
situation and, in an interacting fashion, adapting the sequence
control for the valve-controlled hydrostatic displacement
machine.
2. The control arrangement as defined by claim 1, wherein the
bidirectional communications lines are formed by a CAN bus or a
Flexray bus line having at least one data input-and-output
interface, and/or having a pulse width modulation interface and/or
having a serial interface and/or having an interface to a control
device of a mass store, and/or having an interface to an
analog/digital converter.
3. The control arrangement as defined by claim 1, wherein the
bidirectional communications lines, within the overall system,
furnish transmission of bidirectional signals by means of global
system variables.
4. The control arrangement as defined by claim 1, wherein the
information is error information, by means of which an electrical
error, a short circuit to a battery power supply, a short circuit
to a ground potential, a line interruption, a sensor error, a
faulty operating state, and/or a communications error between
portions of the control arrangement is detectable.
5. The control arrangement as defined by claim 1, wherein the at
least one control unit is arranged for triggering intelligent
integrated circuits which are disposed in the sensor electronics
portion and/or in the power electronics portion, and is arranged in
an event of an error for detecting an affected component as
defective, and on a basis of integrated error set reaction models,
for no longer triggering, or triggering only to a restricted extent
within a range of known tolerance ranges, and optionally for
distributing an incident load between remaining, nondefective
components or correspondingly handling the integrated error set
reaction models.
6. The control arrangement as defined by claim 1, wherein the power
electronics portion is disposed directly on a valve of the
valve-controlled hydrostatic displacement machine, and the at least
one control unit sends a control signal, generated therefrom,
directly to the valve containing the power electronics portion.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is based on German Patent Application 10
2009 058 365.3 filed on Dec. 15, 2009.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to a control arrangement for a
valve-controlled hydrostatic displacement machine, having
triggering electronics for triggering, regulating and operating a
valve-controlled hydrostatic displacement machine or piston engine,
and relates in particular to the furnishing of suitable software
and hardware components for triggering, regulating and operating a
valve-controlled hydrostatic displacement machine.
[0004] 2. Description of the Prior Art
[0005] Hydrostatic drives, comprising a hydropump which drives a
hydromotor via a fluid line, have in the meantime gained wide
distribution in mechanical and systems engineering but also in
automotive engineering. Among these hydraulic or hydrostatic
displacement engines (piston or hydraulic engines) used in this
field as drives are pumps and motors that operate on the principle
of positive displacement and as a rule have the same structural
layout. By means of suitable controlling of the flow of liquid,
pumps in particular can function as motors, and vice versa. Because
of the distinction in the direction of operation, it is true of
so-called hydropumps that they convert mechanical power into
hydraulic power, and for so-called hydromotors that they convert
hydraulic power back into mechanical power.
[0006] More recent drive mechanisms that are especially suitable
for vehicles are digital displacement machines, which operate on
the principle of "digital displacement" and are designed
predominantly as multi-cylinder pumps and/or multi-cylinder motors
and/or multi-cylinder pump motors, for instance as radial piston
machines. In this type of machines, each cylinder has at least two
valves, such as plate valves, slide valves, combination valves, and
the like, of which one is a low-pressure valve communicating with a
low-pressure fluid, and the other is a high-pressure valve
communicating with a high-pressure fluid. A microcontroller reads a
piston position or shaft position sensor and controls or regulates
one or more of the valves. A hydraulic motor is attained when the
high-pressure valve is triggered as well.
[0007] While the above type of drive mechanisms has considerable
advantages, particularly in the automotive field, or in other words
for motor vehicles and in that field for instance as a gear-axle
drive unit, advantages such as a fast response speed and inherent
energy efficiency because of high efficiency, until now it was
necessary to use a complicated triggering chain, comprising among
other things a circuit board assembly, each with at least one
microcontroller as the control unit, one interface, one FPGA (field
programmable gate array), as an array of logic gates that can be
configured in the application field, and field effect
transistors.
[0008] Disadvantageously, as a result, the professional knowledge
employed and the functionality of the arrangement are distributed
over the entire triggering chain. Since the FPGA, operating like a
port expander, receives only bus signals from the microcontroller
and shifts them within a predeterminable time to corresponding end
stages and as a result triggers the end stages, signals are
forwarded in only one direction and do not contain any diagnostic
or feedback signals. Because of the lack of feedback among the
components, error sources are furthermore quite difficult to
locate. The FPGA itself is vulnerable to error and difficult to
analyze. Finally, the use of FPGAs in the automotive field may not
be permitted in every case.
[0009] Thus the known triggering chain, which is based on the use
of an FPGA, prevents use in mass production. Moreover, the assembly
having the field effect transistors has no diagnosis capabilities,
so that errors cannot be detected. Still, there is a need for such
error detection in the on-road field, for instance for on-board
diagnosis (OBD) directly in a vehicle.
OBJECT AND SUMMARY OF THE INVENTION
[0010] It is therefore an object of the invention to improve the
known, complicated triggering chain of the triggering electronics
for a valve-controlled hydrostatic displacement machine and to
create an optimized triggering chain that furnishes diagnostic
capabilities and makes on-road use possible.
[0011] By means of an optimized triggering chain, which includes a
standard control unit with corresponding power electronics and
sensor electronics, the functionalities are clearly separated. Data
and information are exchanged between the components, so that on
the basis of the diagnostic capabilities thus arising, the demands
for use in the on-road field are met.
[0012] The fundamental concept of the invention is thus, by means
of an optimized triggering chain, which includes a standard control
unit with corresponding power electronics and sensor electronics,
to clearly separate functionalities and make it possible for data
and information to be capable of being exchanged among the
components and that interaction can take place. Further
improvements in terms of diagnostic capabilities, installation
space, and pressure and temperature compensation for electronic
components and the entire system can be attained by the use of
intelligent circuits on the part of the power electronics.
Moreover, by the communication via buses, economies in terms of
port contacts at the control unit are possible.
[0013] In particular, according to the invention, for instance and
among other things by means of a reduction in processor load by
shifting the regulation and/or diagnosis to an intelligent power
electronics portion, advantages are attained in view of fast error
location, a low number of interfaces, and fast interventions into a
sequence control by means of bidirectional data and information
exchange. Moreover, error sensor electronics can be detected, and
it becomes possible to integrate standard components with software
and/or hardware synergies in development and production.
[0014] According to the invention, the control arrangement for a
valve-controlled hydrostatic displacement machine is characterized
by: at least one control unit for controlling the valve-controlled
hydrostatic displacement machine; a sensor electronics portion for
detecting sensor data of a power electronics portion and of the
valve-controlled hydrostatic displacement machine; and the power
electronics portion, for furnishing a current required for
operating the valve-controlled hydrostatic displacement machine via
power-transmitting line connections between the power electronics
portion and the valve-controlled hydrostatic displacement machine;
wherein the at least one control unit, the sensor electronics
portion, and the power electronics portion, as well as the sensor
electronics portion, the power electronics portion, and the
valve-controlled hydrostatic displacement machine are each
connected to one another, via bidirectional communications lines,
which differ from the line connections transmitting the power, in
such a way that functionalities of the at least one control unit,
the sensor electronics portion, the power electronics portion, and
the valve-controlled hydrostatic displacement machine are assigned,
separately from one another to these units and portions, and data
and information are capable of being exchanged between these units
and portions; and the at least one control unit is arranged for
detecting information from the sensor electronics portion, the
power electronics portion, and/or the valve-controlled hydrostatic
displacement machine, centrally in only the at least one control
unit, and reacting to information which represents a changed
situation and, in an interacting fashion, adapting the sequence
control for the valve-controlled hydrostatic displacement
machine.
[0015] According to the invention, the evaluation is not limited to
evaluation in only precisely one control unit; instead, the
evaluation per se can also be distributed to a plurality of control
units, and the power-transmitting line connections differ
physically from the bidirectional communications lines.
[0016] Preferably, the bidirectional communications lines are
formed by a CAN bus having at least one data input-and-output
interface, and/or having a pulse width modulation interface and/or
having a serial interface and/or having an interface to a control
device of a mass store, and/or having an interface to an
analog/digital converter.
[0017] Also or alternatively, it is preferred that the
bidirectional communications lines, within the overall system,
furnish transmission of bidirectional signals by means of global
system variables.
[0018] In the context of the information, the information is among
other things error information, by means of which an electrical
error, a short circuit to a battery power supply, a short circuit
to a ground potential, a line interruption, a sensor error, a
faulty operating state, and/or a communications error between
portions of the control arrangement is detectable.
[0019] Preferably, the at least one control unit is arranged for
triggering intelligent integrated circuits which are disposed in
the sensor electronics portion and/or in the power electronics
portion, and is arranged in the event of an error to identify an
affected component as defective and no longer to trigger it, and to
distribute the incident load among the remaining, nondefective
components.
[0020] Also preferably, a power electronics portion is disposed
directly on a valve of the valve-controlled hydrostatic
displacement machine, and the at least one control unit sends a
control signal, generated by it, directly to the power electronics
portion disposed on the valve.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The invention will be better understood and further objects
and advantages thereof will become more apparent from the ensuing
detailed description of a preferred embodiment taken in conjunction
with the drawings, in which:
[0022] FIG. 1 is a simplified block diagram of a triggering chain
in one exemplary embodiment of the invention;
[0023] FIG. 2 is a simplified block diagram of an improved
triggering chain in the exemplary embodiment of the invention;
and
[0024] FIG. 3 is a simplified block diagram of a known triggering
chain version.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0025] FIG. 3 shows a simplified block diagram of a known version
of a triggering chain for triggering a microcontroller 30, an FPGA
circuit board 32 or field programmable gate array circuit board, as
an arrangement of logic gates that can be configured in the
application field, a power electronics assembly 34 that contains
field effect transistors, and finally a valve-controlled
hydrostatic displacement machine 36, or engine pump motor/drive
pump motor (EPM/DPM).
[0026] In FIG. 3, the entire triggering chain is unidirectional;
that is, it works solely in one direction: The microcontroller 30,
as a control unit into which the intelligence of the system is
programmed, issues activation commands, via a serial bus not shown
in detail, to the FPGA circuit board 32 or assembly comprising a
circuit board with FPGAs disposed on it. The circuit board 32
receives the commands from the microcontroller 30 and triggers the
downstream individual power stages of the power electronics
assembly 34 accordingly; the power electronics makes a requisite
current available for the valves of the valve-controlled
hydrostatic displacement machine 36. To that end, so-called
time-data sets or timings, must be stored in memory in the FPGA
circuit board 32 for supplying current to the valves, and these
data sets determine how long and with what current a valve of the
displacement machine 36 will be supplied. As a consequence, some of
the intelligence of the entire system must be also be present on
the FPGA circuit board 32.
[0027] The known FPGA circuit board 32, because of the mode of
operation in only one direction of the known triggering chain,
however, has no possibilities whatever for monitoring the power
electronics assembly 34. Commands are therefore executed
unconditionally, without any possibility of reacting to an incident
problem, the failure of a valve, or the like in the downstream
power electronics assembly 34 and/or in the displacement machine
36. Thus in principle, in this known structure only control is
done, but not regulation. Because of the lack of feedback to the
actual power electronics assembly 34, the microcontroller 30 also
lacks any capability of varying or changing a mode of operation if
necessary if a problem arises, so that in the event of failure of a
valve of the displacement machine 36, for instance, it continues to
try to activate the corresponding cylinder of the displacement
machine 36, without any error correction strategy or
capability.
[0028] FIG. 1 shows a simplified illustration of the triggering
chain of the hydrostatic displacement machine in one exemplary
embodiment, having at least one control unit 10, which can for
instance be at least one microcontroller or an engine control unit
containing at least one microcontroller, a sensor electronics or
sensor electronics portion 12, and power electronics or a power
electronics portion 14 for regulating a valve-controlled
hydrostatic displacement machine 16 as the triggered engine pump
motor/drive pump motor (EPM/DPM). The triggering chain of FIG. 1
comprises both software and hardware components. Only by means of
connections of the components as shown in FIG. 1 and communication
by way of these connections, or in other words by an interplay of
the components, is it possible to generate and obtain error
information from various regions of the triggering chain, to
evaluate such error information centrally via the at least one
control unit 10, and to react to a new situation. However, the
invention is not limited to that; on the contrary, still other
combinations of the aforementioned elements and blocks that meet
the control purpose are also possible, to suit the requirements of
a specific application.
[0029] With regard to a material connection of the portions and
blocks shown in FIG. 1, fluid-carrying segments communicate by
means of pipelines or hollow conductors and are connected to
current and/or voltage as well as segments that process data
signals by means of electric conductor tracks. In particular, the
triggering chain is intrinsically in communication internally by
means of suitable buses, for example and preferably a CAN data bus
or some other bus system suitable for the purpose, which also make
the connection with the control unit 10.
[0030] The CAN data bus used in this exemplary embodiment for
instance transmits a driver demand, for instance his request for
power, via an accelerator pedal (not shown) and/or a brake pedal
(not shown) of a vehicle, in which the triggering chain of the
exemplary embodiment is used, to various responsible control units
or engine control units, which then, in a manner known per se,
regulate and/or control the collaboration of drive components to
suit particular dynamic requirements. At the same time, the status
of all the drive components is monitored via bus data forwarding.
Advantageously, the aforementioned control units can also have
adaptable functions and performance graphs, so that a number of
possible drive variants can be taken into account in the most
suitable possible way.
[0031] Between the control unit 10 and the portions, downstream of
it, of the sensor electronics 12 and power electronics 14 and the
displacement machine 16, respective suitable interfaces are
furnished. These include, to name only a few, not shown per se,
preferably the CAN (controller area network) interface or some
other bus system suitable for the purpose, a DIO (digital
input/output) interface for data input and output, a PWM or pulse
width modulation interface, an SPI (serial peripheral interface)
for serially connectable external or peripheral devices, an MSC
interface to a control device of a mass store, and an ADC
(analog/digital converter) interface to an analog/digital
converter. In general, via these interfaces, all kinds of
communications and/or control signals are carried, and these
interfaces can also be bus interfaces, such as Flexray, EEPROM, and
the like.
[0032] A system error occurring in the sensor electronics portion
12, the power electronics portion 14 or the displacement machine 16
can for instance be an electrical error, such as a short circuit to
a battery (not shown), a short circuit to a system ground
potential, an interruption for instance of a line connection
resulting in an open load, a communications error at the SPI,
detection of an excessively high temperature in the vicinity of an
intelligent circuit, and the like. Other system errors can be due
to sensor errors in system sensors involved and to faulty operating
states associated with them, and the like.
[0033] It will be noted that the intelligent integrated circuits or
IC components used for the field of engine control units are highly
integrated and are adapted in such a way to one another, and have
gone through such complicated processes for quality assurance, that
functionalities which are needed for attaining the triggering chain
are supported by only one electronic component that requires little
space on a circuit board. Among others, such functionalities are
preferably the representation of a current booster phase or current
amplifier phase upon triggering of valves, embodied as solenoids,
of the displacement machine 16, which serve to build up as fast as
possible in these magnetic circuits by way of briefly drawing
energy for generating a peak current for fast acceleration from a
booster or amplifier capacitor; the current booster phase can then
be followed suitably by maintenance current levels, the furnishing
of a capability of switching on or off and/or switchover of various
current levels, and fast extinction of magnetic circuits.
[0034] For detecting such system errors, beginning at the level of
the sensor electronics portion 12 and of the power electronics
portion 14, sensor values of various sensors installed in the
system and--preferably actual--operating states detected are
forwarded to the control unit 10 in the form of sensor values, data
and signals, among other things.
[0035] The control unit 10 takes over the detected values, data
and/or signals forwarded from the level of the sensor electronics
portion 12 and of the power electronics portion 14 and then, on the
basis of them, carries out various calculations in a calculation
portion (not shown) and evaluations in an evaluation portion (not
shown), or an evaluation logic furnished for the purpose.
[0036] Model-based calculation and/or plausibility checking can be
performed as examples of such calculations. Model-based
calculation, on the basis for instance of predetermined
characteristic curves, tables, and/or other data, such as empirical
data, serves to ascertain predetermined values for the actual
system detection values detected and the data and/or signals to be
taken into account and also serves, for the various predetermined
values, to determine permissible tolerance ranges within which the
system detection values, data and/or signals should or must be
located in order to be capable of being classified as either valid
or in other words error-free, or invalid or in other words
erroneous. The plausibility check can additionally be used in the
model-based calculation to substantiate or counter the outcome of
the model-based calculation, or can be used as an additional,
separate criterion. The plausibility calculation can serve for
example to ascertain quickly and/or as an estimated finding whether
a value to be checked can still be an appropriate value so that
more-complicated model-based calculation must be performed, or as
already so far from system values that the more-complicated
model-based calculation can safely be dispensed with. As a result,
a fast reaction time of the triggering chain can be attained, or
the available computation power can be distributed more suitably.
Moreover, it can be provided that the control unit 10 performs a
monitoring operation, which responds for instance to the lack of a
detected value, data or signal, or which from threshold values
detects that predetermined ranges and the like have been overshot
or undershot. The evaluation logic, finally, can also include
suitable circuit arrangements and/or routines for suitable
conversion and/or processing, such as filtering, amplification, or
buffer storage, of the values, data and signals forwarded to the
control unit 10 into correspondence values that can be better
further processed.
[0037] If the control unit 10 finds that an error has occurred that
requires changed control commands and/or reactions, for instance in
accordance with a predetermined model, then the control unit 10
converts this into control commands, reactions to reported errors,
and monitoring strategies that are suitable for the power
electronics portion 14 and issues correspondingly required control
commands, values, data and/or signals for corrected control or
regulation of the pump motor 16.
[0038] FIG. 2 shows what compared to FIG. 1 is a further-improved
structure of a triggering chain according to the exemplary
embodiment of the invention. Here, a control unit 20, as indicated
by the outline, triggers intelligent integrated circuits or ICs in
the sensor electronics portion 22 and/or the power electronics
portion 24 directly, which portion then furnishes a requisite
current for a valve-controlled hydrostatic displacement machine or
a pump motor 26 (EPM/DPM). These intelligent integrated circuits
can include capabilities for component error detection, such as
detecting a short circuit to the battery and/or ground, an
excessive temperature detection, and so forth. Evaluating such
error information then opens up additional capabilities for the
control unit 20 with regard to system or status monitoring of the
downstream components of the triggering chain having the pump motor
26.
[0039] The structure of the triggering chain furthermore contains a
corresponding sensor electronics 22 for current measurements,
temperature measurements, voltage measurements, and the like, in
the form of current sensors, temperature sensors and voltage
sensors and the like, which are used to exchange bidirectionally
detected information among the various components of the triggering
chain via buses, data lines, and the like.
[0040] For example, such bidirectional bus and data connections
exist between the control unit 20 and the sensor electronics
portion 22, between the control unit 20 and the power electronics
portion 24, between the sensor electronics portion 22 and the power
electronics portion 24, between the sensor electronics portion 22
and the pump motor 26, and between the power electronics portion 24
and the pump motor 26. It will be noted that here the bidirectional
communication between the control unit 20 and the sensor
electronics portion 22 can take place by way of CAN and/or, if the
sensor electronics portion 22 is for instance linked directly to
the control unit 20, this can be done internally in the engine
control unit by means of other suitable communications
capabilities, such as via global variables, also known as messages,
which can be tracked for their data consistency.
[0041] The bidirectional communications lines can thus furnish a
transmission of bidirectional signals by means of global system
variables. As a result, by means of the triggering chain of the
present exemplary embodiment, system and status information can
also be furnished, which need not necessarily be information
pertaining to any errors but can also involve information which can
be used for bringing about and/or improving system stability
(robustness), and for optimization for instance in terms of transit
times, wear phenomena, pulsations, and the like.
[0042] As a result, the control unit 20 is capable of ascertaining
and/or monitoring the status of the overall system, controlled,
regulated and/or monitored by it, on the basis of the detected
information, data and signals. In the structure shown, the
intelligence of the entire system, or in other words the control
software, characteristic curves, models, time data sets, and the
like, is thus collected or concentrated at only one location, that
is, in the control unit 20.
[0043] By means of the exchange of information between the various
components of the triggering chain by way of the above-described
connection structure, in combination with the intelligent
integrated circuits in the sensor electronics portion 22, the power
electronics portion 24 and optionally the pump motor 26, this
control unit 20 is thus, by itself and independently, capable of
reacting to error situations in the downstream system. For
instance, if the failure of a valve of the pump motor 26 or of a
power end stage in the power electronics portion 24 is detected,
this power end stage can be identified by the control unit 20 as
"damaged" and shut off for the further course of operation, and in
that case the incident load can be distributed to or among the
other cylinders/components of the power electronics portion 24 and
of the pump motor 26.
[0044] In a modification of the improved triggering chain of the
exemplary embodiment of the invention, the power electronics
required for a valve (not shown) of the pump motor 26 can be
disposed "on-board", directly on the valve. In this case, a control
signal generated by the control unit 20 can be sent directly, via
suitably designed bus connections, to the valve containing the
power electronics, and/or information data detection and monitoring
can be done by the control unit 20 directly at such a valve.
[0045] Thus, by optimizing the triggering chain using a standard
control unit 20 and a corresponding power electronics portion 24
and sensor electronics portion 22, the triggering chain that is
improved according to the invention for a valve-controlled
hydrostatic displacement machine enables a clear separation of the
individual functionalities, an exchange of data and information
among the individual components, and an interaction among them, in
conjunction with improved diagnostic capabilities, improved space
and improved temperature management for the electronic components,
while at the same time economizing on port contacts as a result of
the intelligent integrated circuits used for the purpose.
[0046] Because of the integration of standard components for
software, that is, control programs and sequence controllers, and
hardware, that is, electronic components, are integrated, which
advantageously achieves the utilization of synergies in the
development and production of various fields, the result is
simpler, more-economical mass production with the aforementioned
properties, while at the same time furnishing fast error location,
a bidirectional exchange of information and data that permits fast
interventions into the sequence control, and the detection of error
sensor electronics. The use of field-programmable logic, which
until now was a severe restriction as well as critical and
complicated, is dispensed with.
[0047] Thus, a control arrangement for a valve-controlled
hydrostatic displacement machine has been described, containing: at
least one control unit for controlling the valve-controlled
hydrostatic displacement machine; a sensor electronics portion for
detecting sensor data of a power electronics portion and of the
valve-controlled hydrostatic displacement machine; and the power
electronics portion for furnishing a current, necessary for
operating the valve-controlled hydrostatic displacement machine,
via power-transmitting line connections between the power
electronics portion and the valve-controlled hydrostatic
displacement machine; wherein the at least one control unit, the
sensor electronics portion, and the power electronics portion, as
well as the sensor electronics portion, the power electronics
portion, and the valve-controlled hydrostatic displacement machine
are each connected to one another, via bidirectional communications
lines as depicted in FIG. 2, which differ from the line connections
transmitting the power, in such a way that functionalities of the
at least one control unit, the sensor electronics portion, the
power electronics portion, and the valve-controlled hydrostatic
displacement machine are assigned, separately from one another to
these units and portions, and data and information are capable of
being exchanged between these units and portions; and the at least
one control unit is arranged for detecting information from the
sensor portion, the power electronics portion, and/or the
valve-controlled hydrostatic displacement machine, centrally in
only the at least one control unit, and reacting to information
which represents a changed situation and, in an interacting
fashion, adapting the sequence control for the valve-controlled
hydrostatic displacement machine.
[0048] The foregoing relates to a preferred exemplary embodiment of
the invention, it being understood that other variants and
embodiments thereof are possible within the spirit and scope of the
invention, the latter being defined by the appended claims.
* * * * *